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HelpReport



HOW CAN WE HELP?

BEFORE SUBMITTING A REPORT, LET'S TRY AND SEE IF WE'VE ALREADY ANSWERED YOUR
QUESTION.
START BY SELECTING A CATEGORY OR SEARCHING BELOW.


Advanced SecurityHaving trouble accessing any websites using a compatible xFi
Gateway.
PostmasterIf you're having an issue with sending or receiving E-Mail with
Comcast.


FREQUENTLY ASKED QUESTIONS

WHAT DO I NEED TO KNOW TO AVOID BLOCKS WHEN SENDING TO COMCAST?

WHAT DO I NEED TO KNOW TO AVOID BLOCKS WHEN SENDING TO COMCAST OVER IPV6?

WHAT ARE COMCAST'S OUTBOUND MAIL SERVERS?

WHAT ARE COMCAST'S MAIL DELIVERY ERROR MESSAGES?

UNDERSTAND EMAIL ERROR MESSAGES AND THEIR CODES

INTRODUCTION

When sending email, you'll occasionally receive an error message with its own
code. Here's an explanation of the codes—along with a recommendation on how to
fix each error.
Note: In the event you need to contact your email administrator, be sure to
include the error message. It contains important information.

BL000000 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000000. WHAT DOES THIS MEAN?

Our filters have determined that email from your email server has been sent in
patterns which are characteristic of spam. In an effort to protect subscribers,
your email server has been blocked from sending email to the Comcast network.
Mail servers are typically shared by many users so it may be the case that
another party using your email server has sent spam, even if you have not.

How do I get my IP removed from the blocklist?

It is important that your email administrator is aware of their outbound spam
problem to avoid being blocked by Comcast in the future. When contacting your
email administrator, you should include the error message contained in the email
which alerted you to this problem. This error message contains important
information to help your email administrator resolve this issue. Removal
requests can be submitted here and will require the IP address of the blocked
email server.

BL000001 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000001. WHAT DOES THIS MEAN?

Your email could not be delivered because your sending IP address is listed on
the Spamhaus Zen. This is a list of IP addresses which have been detected as
sending spam and also contains dynamically assigned IP addresses which are not
supposed to send email directly to email servers. Comcast uses these lists to
protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Spamhaus website in order to request
removal.

BL000010 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000010. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Cloudmark Sender Intelligence (CSI). CSI is a list of IP addresses which have
been detected as sending spam. Comcast uses this list to protect its subscribers
from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the CSI website, in order to request
removal.

BL000011 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000011. WHAT DOES THIS MEAN?

Your email could not be delivered because your sending IP address is listed on
both Cloudmark Sender Intelligence (CSI) and the Spamhaus Zen. Both are lists of
IP addresses which have been detected as sending spam and also contain
dynamically assigned IP addresses which are not supposed to send email directly
to email servers. Comcast uses these lists to protect its subscribers from
receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the CSI website and the Spamhaus website in
order to request removal.

BL000100 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000100. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Return Path Repuation Network Blocklist. This is a list of IP addresses that
have been detected as sending spam. Comcast uses this list to protect its
subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. Either you or your email
provider can visit the Return Path website, in order to request removal.

BL000101 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000101. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Return Path Reputation Network Blacklist, as well as the Spamhaus Zen. These are
lists of IP addresses which have been detected as sending spam and also contain
dynamically assigned IP addresses which are not supposed to send email directly
to email servers. Comcast uses these lists to protect its subscribers from
receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Return Path website, and the Spamhaus
website, in order to request removal.

BL000110 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000110. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on both
the Return Path Reputation Network Blacklist, as well as the Cloudmark Sender
Intelligence (CSI). Both are lists of IP addresses which have been detected as
sending spam and also contain dynamically assigned IP addresses which are not
supposed to send email directly to email servers. Comcast uses these lists to
protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve the issue. To address this issue, either you
or your email provider can visit the Return Path website, and the CSI website,
in order to request removal.

BL000111 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL000111. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Return Path Reputation Network Blacklist, the Cloudmark Sender Intelligence
(CSI), as well as the Spamhaus Zen. These are lists of IP addresses which have
been detected as sending spam and also contain dynamically assigned IP addresses
which are not supposed to send email directly to email servers. Comcast uses
these lists to protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Return Path website, the CSI website,
and the Spamhaus website, in order to request removal.

BL001000 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001000. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL). VTL is a list of IP addresses which have been detected
as sending spam. Comcast uses this list to protect its subscribers from
receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website in order to request
removal.

BL001001 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001001. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), as well as the Spamhaus Zen. These are lists of IP
addresses which have been detected as sending spam. Comcast uses this list to
protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website in order to request
removal, and the Spamhaus website, in order to request removal.

BL001010 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001010. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), as well as the Cloudmark Sender Intelligence List (CSI).
These are lists of IP addresses which have been detected as sending spam.
Comcast uses this list to protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website in order to request
removal, and the CSI website to requests removal.

BL001011 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001011. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), Cloudmark Sender Intelligence, and Spamhaus Zen. These
are lists of IP addresses which have been detected as sending spam. Comcast uses
this list to protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website, the CSI website, and the
Spamhaus website, in order to request removal.

BL001100 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001100. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), as well as the Return Path Reputation Network Blacklist.
These are lists of IP addresses which have been detected as sending spam.
Comcast uses this list to protect its subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website, and the Return Path
website, in order to request removal.

BL001101 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001101. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), the Return Path Reputation Network Blacklist, and the
Spamhaus Zen list. These are lists of IP addresses which have been detected as
sending spam. Comcast uses this list to protect its subscribers from receiving
spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website, and the Return Path
website, and the Spamhaus website, in order to request removal.

BL001110 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001110. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), the Return Path Reputation Network Blacklist, and
Cloudmark Sender Intelligence (CSI). These are lists of IP addresses which have
been detected as sending spam. Comcast uses this list to protect its subscribers
from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website, and the Return Path
website, and the Spamhaus website, in order to request removal.

BL001111 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE BL001111. WHAT DOES THIS MEAN?

Your email could not be delivered because your email provider is listed on the
Vade Threat List (VTL), the Return Path Reputation Network Blacklist, Cloudmark
Sender Intelligence, and the Spamhaus Zen list. These are lists of IP addresses
which have been detected as sending spam. Comcast uses this list to protect its
subscribers from receiving spam.

How do I remediate the block?

It is important that your email provider is aware of their outbound spam problem
to avoid being blocked by Comcast in the future. When contacting your email
provider, you should include the error message contained in the email that
alerted you to this problem. This error message contains important information
to help your email provider resolve this issue. To address this issue, either
you or your email provider can visit the Vade website in order to request
removal, and the Return Path website, the CSI website, and the Spamhaus website,
in order to request removal.

DM000001 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE DM000001. WHAT DOES THIS MEAN?

This message has been rejected by the Comcast mail servers due to the sending
domain's published DMARC policy. The sending domain has published a DMARC reject
policy and this message has not passed either DKIM or SPF authentication for the
domain. For more information on DMARC, visit DMARC.org.

ES000001 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE ES000001. WHAT DOES THIS MEAN?

You have been blocked from sending to the Comcast network because we have
determined that you are sending email from a dynamic/residential IP address
within the Comcast domain. Comcast does not allow subscribers to send email from
email servers other than smtp.comcast.net.

I don't believe my email is originating from a dynamic/residential source.*

Your IP space is designated for residential Comcast service. You can send or
receive email through the Comcast email servers by using our webmail application
or by configuring your email client to connect properly. If you need to run your
own email server, please contact our Commercial Services organization.

How do I get my IP removed from the blacklist?

Since you are connecting through Comcast residential IP space, this restriction
cannot be lifted at this time. Please see the above instructions on "how to"
options to send email without lifting this block.

ES000010 :: MAIL TO COMCAST IS REJECTED AND IS RETURNED WITH AN ERROR MESSAGE
CONTAINING THE CODE ES000010. WHAT DOES THIS MEAN?

You have been blocked from sending to the Comcast network because we have
determined that you are sending email from dynamic/residential IP space. Comcast
does not allow residential / dynamic IP addresses to directly connect to our
email servers. In most cases, Comcast will classify your email server's IP
address as dynamic if the reverse DNS does not comply with standard static
naming conventions.

How do I get my IP removed from the blocklist?

It is important that you ask your email provider to review the settings of your
email server to ensure it is set up correctly so that it is not blocked by
Comcast in the future. When contacting your email administrator, you should
include the error message contained in the email which alerted you to this
problem. This error message contains important information to help your email
administrator resolve this issue.

ODM00001 :: MAIL I'M SENDING FROM COMCAST WAS REJECTED AND RETURNED AN ERROR
MESSAGE CONTAINING THE CODE ODM00001. WHAT DOES THIS MEAN?

This error applies to our outbound systems. When a sender attempts to use a
domain in the From address which is protected by a DMARC "reject" policy, and we
have no method by which we can properly provide authentication (SPF or DKIM) for
the message, our systems will not accept those messages. DMARC (RFC7489) is a
system where the domain owner has declared a policy for how unauthenticated
messages should be treated.

RL000001 :: MAIL TO COMCAST IS QUEUED AND I SEE RL000001 IN MY EMAIL LOGS. WHAT
DOES THIS MEAN?

Comcast has instituted rate limiting on all inbound email traffic. This step was
taken to protect our customers and our email system from unwanted spam and
malicious attacks. Any systems affected by this rate limit will receive a 4xx
message (temp-fail) during the SMTP transaction. This message is designed to
instruct the sending server to try again at a later time to deliver its email.

Our rate limiting policy is based on sender reputation, provided by SenderScore
as well as authentication of the sending server, regardless of the number of
domains from that server.

Recipients per Hour SenderScore* 120 N/A 1,200 0 - 15 3,600 16 - 25 6,000 26 -
30 12,000 31 - 50 24,000 51 - 70 42,000 71 - 85 60,000 86 - 100

*Subject to successful authentication

If the rate-limit is impacting your ability to deliver email, shortening your
server's delivery retry interval may resolve the issue. Please be mindful that
these are reputation-based mechanisms, and there are many factors that can
impact those reputations. If the sending entity has poor reputation, sending
"faster" or "more", may be increasingly detrimental. Ensure that you've also
evaluated engagement, list auditing, and other best practices.

RL000003 :: MAIL TO COMCAST IS QUEUED AND I SEE RL000003 IN MY EMAIL LOGS. WHAT
DOES THIS MEAN?

Comcast has instituted rate limiting on all inbound email traffic. This step was
taken to protect our customers and our email system from unwanted spam and
malicious attacks. Any systems affected by this rate limit will receive a 4xx
message (temp-fail) during the SMTP transaction. This message is designed to
instruct the sending server to try again at a later time to deliver its email.

This rate limiting policy is based on historical volumes and quality of that
volume. The limits applied are independent of the number of domains originating
from a given IP. This policy should apply to both IPv4 and IPv6.

New IP addresses that are expected to send significant amounts of email to
Comcast subscribers should start by sending low volumes of mail, increasing as
time goes on. As your IP sends more email, its limit will increase daily.

If the rate-limit is impacting your ability to deliver email, shortening your
server's delivery retry interval may resolve the issue. Please be mindful that
these are reputation-based mechanisms, and there are many factors that can
impact those reputations. If the sending entity has poor reputation, sending
"faster" or "more", may be increasingly detrimental. Ensure that you've also
evaluated engagement, list auditing, and other best practices.

RL000010 :: MAIL TO COMCAST IS QUEUED AND I SEE RL000010 IN MY EMAIL LOGS. WHAT
DOES THIS MEAN?

Comcast has instituted rate limiting on all inbound email traffic. This step was
taken to protect our customers and our email system from unwanted spam and
malicious attacks. Any systems affected by this rate limit will receive a 4xx
message (temp-fail) during the SMTP transaction. This message is designed to
instruct the sending server to try again at a later time to deliver its email.

This rate limiting policy is based on historical volumes and quality of that
domain's volume. This should apply to both DKIM and SPF.

New domains that are expected to send significant amounts of email to Comcast
subscribers should start by sending low volumes of mail, increasing as time goes
on. As your domain sends more email, and our systems receive positive feedback
from users, its limit will increase daily.

If the rate-limit is impacting your ability to deliver email, shortening your
server's delivery retry interval may resolve the issue. Please be mindful that
these are reputation-based mechanisms, and there are many factors that can
impact those reputations. If the sending entity has poor reputation, sending
"faster" or "more", may be increasingly detrimental. Ensure that you've also
evaluated engagement, list auditing, and other best practices.

RL000020 :: MAIL TO COMCAST IS QUEUED AND I SEE RL000020 IN MY EMAIL LOGS. WHAT
DOES THIS MEAN?

Comcast has instituted rate limiting on all inbound email traffic. This step was
taken to protect our customers and our email system from unwanted spam and
malicious attacks. Any systems affected by this rate limit will receive a 4xx
message (temp-fail) during the SMTP transaction. This message is designed to
instruct the sending server to try again at a later time to deliver its email.

This should apply to unauthenticated email.

If the rate-limit is impacting your ability to deliver email, shortening your
server's delivery retry interval may resolve the issue. Please be mindful that
these are reputation-based mechanisms, and there are many factors that can
impact those reputations. If the sending entity has poor reputation, sending
"faster" or "more", may be increasingly detrimental. Ensure that you've also
evaluated engagement, list auditing, and other best practices.

NON-SPECIFIC ERROR CODES

Error Code Returned For more information 421 - [Too many sessions opened]
Comcast allows 25 simultaneous connections per sending IP address. This error
results when that limit is exceeded. 421 - [Reverse DNS failure : Try again
later] Comcast requires all sending IP addresses have a valid rDNS. This error
results when the lookup failed. This error should be treated as a temp-fail and
can be retried.

SERVFAIL response. 99.9% means that the DNS somewhere up the auth tree is
misconfigured or down or very badly overloaded. 421 - [Try again later] This
error results for several reasons. This error should be treated as a temp-fail
and can be retried. 452 - [Too many emails sent on this session] Comcast allows
1000 emails per session. This error results when that limit is exceeded. 452 -
[Too many recipients for message] Comcast allows 100 recipients per message.
This error results when that limit is exceeded. 550 - [Not our customer] This
error results when a message is sent to a non-existent Comcast customer. These
errors should be treated as an "unsubscribe" by the sender, if a bulk mailer.
550 - [Your message could not be delivered due to too many invalid recipients]
This error results when a message is sent to too many invalid recipients. As a
result none of the recipients received the message. Please check your
distribution list and resend. 550 - [Invalid sender domain] Comcast requires
that all sending domains have a valid A or MX record. This error results when
neither record can be found. 550 - [Account not available] This error results
when a message is sent to a Comcast account that is currently not available. 552
- [Message size exceeded] Comcast allows messages of 15MB or smaller. This error
results when that limit is exceeded. 554 - [PTR lookup failure] Comcast requires
all sending mail server IP addresses have a valid PTR record set up. This error
results when the lookup failed.

NXDOMAIN response. One of the authoritative servers for the relevant section of
the in-addr.arpa DNS tree is saying that there is no PTR record for the given IP
address.

WHAT ARE COMCAST'S DYNAMIC IP RANGES?

HOW DO I GET MY IP BLOCK REMOVED?

HOW DO I SIGN UP FOR COMCAST'S FEEDBACK LOOP?


STILL HAVE A QUESTION?

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